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unit Unit2;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs,printers, StdCtrls;

type
  TMyClass=Class(TPersistent)
    Procedure Showinfo;
  End;
  TMyClass2=Class(TPersistent)
    Procedure Showinfo;
  End;
 


  TForm2 = class(TForm)
    Button2: TButton;
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form2: TForm2;

implementation
{$R *.dfm}



Function GetClass(const S:String):Tobject;
  begin
    Result := FindClass(s).Create;
  end;


{ TMyClass2 }

procedure TMyClass2.Showinfo;
begin
   Showmessage('Ich bin Klasse2')
end;

{ TMyClass }

procedure TMyClass.Showinfo;
begin
   Showmessage('Ich bin Klasse1')
end;
procedure TForm2.Button2Click(Sender: TObject);
begin
  TMyClass( GetClass('TMyClass')).ShowInfo;
end;

initialization
RegisterClasses([TMyClass,TMyClass2]);


end.                    

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Procedure put(const S:String;var C:TPersistent);
begin
  C := FindClass(s).Create;;
end;                    

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type
  TMyBaseClass = class of TMyBase;
  TMyBase = class
    constructor Create; virtual;
  end;
  TMyClass1 = class(TMyBase)
    constructor Create; override;
  end;

procedure TForm1.Button1Click(Sender: TObject);
var
  map: TStringList;
  c: TMyBaseClass;
begin
  map:= TStringList.Create;
  map.AddObject('key1', TObject(TMyClass1));
  //weitere Keys
  c:= TMyBaseClass(map.Objects[map.IndexOf('key1')]);
  c.Create;
end;                    

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map : TDictionary<String, TMeineKlasse>;